journal article·2023-10-24

Interfacial Sulfur-Sensitization of PtNi Nanoalloy for Efficient Electrocatalytic Hydrogen Production in Alkaline Simulated Seawater

Fei Yu, Yu-Xuan Xiao, Jiang-Bo Chen, Ge Tian, Xiong Yang, Fu-Fei Pu, Jin-Yi Ouyang, Kenneth I. Ozoemena, Mark D. Symes, Roberto M. Torresi, Fazhou Wang, Xiao-Yu Yang

Chemistry of Materials· Volume 35· Issue 20
Publisher page

Abstract

Optimization of the electronic structure and surface physicochemical properties of PtNi nanoalloys by incorporation of sulfur (S) is an effective strategy for improving the efficiency of the electrocatalytic hydrogen evolution reaction (HER). However, few studies have been carried out to assess the seawater electrocatalytic performance of PtNi by incorporation of interfacial S from CdS nanocrystals. In this study, a simple method is developed to prepare CdS/PtNi, composed of a PtNi alloy supported with CdS quantum dots (QDs). Experimental data demonstrate that interfacial S-sensitization enhances the electron density of PtNi nanoalloy in CdS/PtNi. Therefore, CdS/PtNi exhibits superior performance toward HER in seawater. Specifically, CdS/PtNi displays a low overpotential of 22 mV at a current density of 10 mA cm –2, a higher specific activity of 24.7 mA cm –2 at −0.07 V, and superior durability in seawater, all of which metrics exceed those of commercial Pt/C. Theoretical calculations provide additional evidence that interfacial S-sensitization of PtNi alloy raises electron densities, lowers the d-band center, facilitates water molecule adsorption, resistances to Cl –, and reduces the hydrogen adsorption Gibbs free energy of PtNi alloy. This study provides new opportunities for the design of efficient and stable electrocatalysts for large-scale production of hydrogen from seawater.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Photocatalysis Techniques · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & State Key Laboratory of Silicate Materials for Architectures & Shenzhen Research Institute, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa

WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom

Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Lineu Prestes 748, São Paulo 05508000, Brazil

Funding

Royal Society · National Key Research and Development Program of China · Saudi Aramco · Basic and Applied Basic Research Foundation of Guangdong Province · China Building Materials Academy · Science, Technology and Innovation Commission of Shenzhen Municipality · Jilin Provincial Scientific and Technological Development Program · Program for Changjiang Scholars and Innovative Research Team in University · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · National Research Foundation of South Africa

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